(c) Push the borescope through the plastic guide tube until the tip comes out of the end of the tube.
(d) Push the tip of the borescope between the nozzle vanes by using the tip deflection control.
(e) Turn on the light source of the BORESCOPE - LIGHT SOURCE SET (856A1322 P03 or P04).
(f) Adjust the borescope equipment to get maximum clarity of view.
(9) Turn the HPT rotor CW (aft looking forward). Stop the rotor at each blade to make sure all of the defects can be seen.
NOTE : To turn the HPT rotor CW, the rotation pad drive must be
____
turned CCW.
(10) Inspect the HPT blades (from the front) and use the limits that follow:
NOTE : It is not easy to visually tell when cooling holes are
____ plugged. Cooling holes which are apparently plugged are permitted if any cracking, erosion or burning is within serviceable limits.
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NOTE : Crack indications which are not completely identified may be
____ sprayed with solvent (CP2011) or an equivalent substitute to remove light engine deposits.
NOTE : When a HPT blade has impact damage, you must do a 360 degree
____ combustor borescope inspection to look for combustor distress (Ref. TASK 72-42-00-290-005).
NOTE : For purposes of estimating the size of any distress, the
____ radial spacing of the trailing edge slots is approximately 0.1 in. (2.55 mm) .
-------------------------------------------------------------------------------INSPECT/CHECK MAXIMUM REMARKS SERVICEABLE LIMITS -------------------------------------------------------------------------------
1. Leading edge for:
A. Axial and radial Any number 0.05 in. See limit extensions
cracks in area A. (1.27 mm) long if they (Ref. TASK 72-00-00-200-do not connect more than 025). 2 holes.
B. Axial and radial Not serviceable.
cracks in areas B
and C, including
root radius not
intersecting nose
or gill holes.
C. Nicks and dents in Any amount.
area A.
D. Nicks and dents in Any amount.
area B.
E. Nicks and dents in 3 permitted, 0.05 in.
area C, including (1.27 mm) long. Nicks
root radius. and dents must be
separated by 0.125 in.
(3.17 mm) minimum.
F. Axial nose or gill Not serviceable. See limit extensions hole cracks, areas (Ref. TASK 72-00-00-200-B and C. 025).
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-------------------------------------------------------------------------------INSPECT/CHECK MAXIMUM REMARKS SERVICEABLE LIMITS -------------------------------------------------------------------------------
G. Radial nose or None allowed in area C, See limit extensions
gill hole cracks, one permitted, 0.03 in. (Ref. TASK 72-00-00-200-
areas B and C. (0.76 mm) long in area 025).
B.
H. Dirt or Any amount.
environmental
build-up.
J. Missing material Any amount provided See limit extensions
in areas A and B. cavity 2 not exposed (Ref. TASK 72-00-00-200-
(max 2 blades per 025).
engine). Repeat the
inspection within 100
hours.
K. Missing material Not serviceable.
in area C.
L. Missing thermal Any amount.
barrier coating.
2. Blade tip for:
NOTE : There are 2 notched blades in the HPT rotor to show the amount of
____
blade tip rubbing. If the notches can or cannot be seen, the
condition is serviceable.
A. Radial cracks on Any number up to 0.15 See limit extensions
convex side not in. (3.8 mm) max radial (Ref. TASK 72-00-00-200-
within 0.50 in. length. 025).
(12.7 mm) of
trailing edge.
B. Radial cracks on Any number up to 0.7 in. See limit extensions
concave side not (17.8 mm) max length. (Ref. TASK 72-00-00-200-
within 0.50 in. 025).
(12.7 mm) of
trailing edge.
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